function rate = stateVariablesProductionRate(t, x)
%Production rate = 5
%   Detailed explanation goes here

    global k1 k2;
    %r is the reference or set point: the desired inventory level
    r = 40;
    
%     k1 = 2.9295;
%     k2 = -0.7049;
%     k1 = 4;
%     k2 = -1;

    rate = r - k1 * x(1) - k2 * x(2);
end

